[GeoffR]

I only have a Glo myself, and I fond the font size is usually the same in ePubs as in KePubs, but some have said that the font size is normally 50% larger in ePubs than in KePubs on some other devices.

The X value in the Set Adobe units per inch patch above is originally 144.0 for some devices and 96.0 for others, and 144 is 50% larger than 96, so that might account for it.

If that is the case then maybe Setting the X value to 96.0 for all devices would fix it? I.e. change the patch to:

Set Adobe units per inch:
  - Enabled: yes
  - Description: |
      This patch sets the value passed to AdobeStyling::setUnitsPerInch(int)
      which only affects the ePub reader.
  # original value is calculated as (scale factor) * X where:
  #   scale factor is as in the previous patch
  #   X = 144.0 for Dragon class devices, X = 96.0 for other devices
  # Other devices (Touch, Glo, etc.):
  - ReplaceBytes: {Offset: 0x4A70C0, FindH: 00 00 C0 42, ReplaceH: 00 00 C0 42}
  # Dragon class devices (AuraHD, H2O, etc.):
  - ReplaceBytes: {Offset: 0x4A70C4, FindH: 00 00 10 43, ReplaceH: 00 00 C0 42}

Edit: From what I can see, the KePub reader uses the same scale for all devices.